"Dark Sky Park" is heaven on Earth for astronomers, one of the rare U.S. locations with no artificial light pollution.

An unusually designed bridge from the 1920s was built to withstand the tides and winds of Maine.

This museum on a college campus pays tribute to the Arctic and to two explorer alumni.

The world's largest rotating world.

This tiny patch of arid sand sits in one of the greenest states in the United States.

An abandoned railroad tunnel is now filled with bioluminescent bugs.

Come for the flowers, stay for the bats!

A defensive fortification carved into a cliff near Sydney Harbour.

The yawning remains of a complex naval fortress still haunt this Australian shore.

This dramatic rail curve was once the target of a failed Nazi attack.

Steepest flood safety railway in the entire world.

Despite its lavish ornamentation, and wholesome lifestyle of its devotees, this mountain commune has faced its share of issues.

This abandoned dream castle and its cemetery look out over the city that once inspired their creation.

One of the few surviving examples of the first lock and dam system built on the Ohio River.

In the middle of an abandoned stretch of old Route 50 lies a tombstone that weighs three tons.

Two gems of Beaux Arts architecture that have been sitting vacant for years.

An occult-y, historic hotel with the World's Largest Ouija board on the roof.

In the parking lot of a fast food restaurant, a statue memorializing a prolific bull elephant.

This former fire tower found new life as a communications hub complete with a scenic overlook.

A beautiful hidden gem in central West Virginia.